WARNING in class_for_each_device ------------[ cut here ]------------ class_for_each_device called for class 'devlink' before it was registered WARNING: drivers/base/class.c:416 at class_for_each_device+0x2d8/0x390 drivers/base/class.c:415, CPU#1: kworker/1:1/37 Modules linked in: CPU: 1 UID: 0 PID: 37 Comm: kworker/1:1 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Workqueue: events deferred_probe_timeout_work_func RIP: 0010:class_for_each_device+0x2fc/0x390 drivers/base/class.c:415 Code: 8d 1d 98 56 26 0a 4c 89 e8 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 ef e8 62 77 9c fc 49 8b 55 00 48 89 df 48 c7 c6 d9 35 6f 8d <67> 48 0f b9 3a b8 ea ff ff ff eb 1b e8 43 e0 31 fc 49 81 c6 90 00 RSP: 0000:ffffc90000ac7a20 EFLAGS: 00010246 RAX: 1ffffffff178a7e0 RBX: ffffffff8fba2d20 RCX: ffff88801ea93e00 RDX: ffffffff8bc553c0 RSI: ffffffff8d6f35d9 RDI: ffffffff8fba2d20 RBP: ffffc90000ac7af8 R08: ffffc90000ac7a7f R09: 0000000000000000 R10: ffffc90000ac7a60 R11: fffff52000158f50 R12: ffffc90000ac7a60 R13: ffffffff8bc53f00 R14: 1ffff92000158f48 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff888125d8b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000000dfb8000 CR4: 00000000003506f0 Call Trace: fw_devlink_drivers_done+0x35/0x50 drivers/base/core.c:1837 deferred_probe_timeout_work_func+0x21/0x220 drivers/base/dd.c:305 process_one_work+0x98b/0x1630 kernel/workqueue.c:3318 process_scheduled_works kernel/workqueue.c:3401 [inline] worker_thread+0xb49/0x1140 kernel/workqueue.c:3482 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ---------------- Code disassembly (best guess): 0: 8d 1d 98 56 26 0a lea 0xa265698(%rip),%ebx # 0xa26569e 6: 4c 89 e8 mov %r13,%rax 9: 48 c1 e8 03 shr $0x3,%rax d: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) 12: 74 08 je 0x1c 14: 4c 89 ef mov %r13,%rdi 17: e8 62 77 9c fc call 0xfc9c777e 1c: 49 8b 55 00 mov 0x0(%r13),%rdx 20: 48 89 df mov %rbx,%rdi 23: 48 c7 c6 d9 35 6f 8d mov $0xffffffff8d6f35d9,%rsi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: b8 ea ff ff ff mov $0xffffffea,%eax 34: eb 1b jmp 0x51 36: e8 43 e0 31 fc call 0xfc31e07e 3b: 49 rex.WB 3c: 81 .byte 0x81 3d: c6 (bad) 3e: 90 nop failed to run ["ssh" "-p" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "IdentitiesOnly=yes" "-o" "BatchMode=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "root@10.128.1.169" "pwd"]: exit status 255 ssh: connect to host 10.128.1.169 port 22: Connection timed out Pseudo-terminal will not be allocated because stdin is not a terminal. Warning: Permanently added '[us-central1-ssh-serialport.googleapis.com]:9600' (ECDSA) to the list of known hosts. serialport: Connected to syzkaller.us-central1-c.ci-upstream-rust-kasan-gce-test-job-parallel-2 port 1 (session ID: af5ddecd1f13de38a330a4cbb0aa5293159d4cb915aed74e78d762a827f09916, active connections: 1). SeaBIOS (version 1.8.2-google) Total RAM Size = 0x0000000200000000 = 8192 MiB CPUs found: 2 Max CPUs supported: 2 SeaBIOS (version 1.8.2-google) Machine UUID 84a68ce8-6edb-4758-b7d1-8379f828c31f found virtio-scsi at 0:3 virtio-scsi vendor='Google' product='PersistentDisk' rev='1' type=0 removable=0 virtio-scsi blksize=512 sectors=4194304 = 2048 MiB drive 0x000f25d0: PCHS=0/0/0 translation=lba LCHS=520/128/63 s=4194304 Sending Seabios boot VM event. Booting from Hard Disk 0... [ 0.000000][ T0] Linux version syzkaller (syzkaller@syzkaller) (Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8) #0 SMP PREEMPT_RT now [ 0.000000][ T0] Command line: BOOT_IMAGE=/boot/bzImage root=/dev/sda1 console=ttyS0 [ 0.000000][ T0] KERNEL supported cpus: [ 0.000000][ T0] Intel GenuineIntel [ 0.000000][ T0] AMD AuthenticAMD [ 0.000000][ T0] x86/CPU: Model not found in latest microcode list [ 0.000000][ T0] BIOS-provided physical RAM map: [ 0.000000][ T0] BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] System RAM [ 0.000000][ T0] BIOS-e820: [mem 0x000000000009fc00-0x000000000009ffff] device reserved [ 0.000000][ T0] BIOS-e820: [gap 0x00000000000a0000-0x00000000000effff] [ 0.000000][ T0] BIOS-e820: [mem 0x00000000000f0000-0x00000000000fffff] device reserved [ 0.000000][ T0] BIOS-e820: [mem 0x0000000000100000-0x00000000bfffcfff] System RAM [ 0.000000][ T0] BIOS-e820: [mem 0x00000000bfffd000-0x00000000bfffffff] device reserved [ 0.000000][ T0] BIOS-e820: [gap 0x00000000c0000000-0x00000000fffbbfff] [ 0.000000][ T0] BIOS-e820: [mem 0x00000000fffbc000-0x00000000ffffffff] device reserved [ 0.000000][ T0] BIOS-e820: [mem 0x0000000100000000-0x000000023fffffff] System RAM [ 0.000000][ T0] printk: legacy bootconsole [earlyser0] enabled [ 0.000000][ T0] ERROR: earlyprintk= earlyser already used [ 0.000000][ T0] ERROR: earlyprintk= earlyser already used [ 0.000000][ T0] Hash pointers mode set to never. [ 0.000000][ T0] Malformed early option 'vsyscall' [ 0.000000][ T0] nopcid: PCID feature disabled [ 0.000000][ T0] NX (Execute Disable) protection: active [ 0.000000][ T0] APIC: Static calls initialized [ 0.000000][ T0] DMI: SMBIOS 2.4 present. [ 0.000000][ T0] DMI: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 [ 0.000000][ T0] DMI: Memory slots populated: 1/1 [ 0.000000][ T0] Hypervisor detected: KVM [ 0.000000][ T0] last_pfn = 0xbfffd max_arch_pfn = 0x400000000 [ 0.000000][ T0] kvm-clock: Using msrs 4b564d01 and 4b564d00 [ 0.000005][ T0] kvm-clock: using sched offset of 8354708297 cycles [ 0.000012][ T0] clocksource: kvm-clock: mask: 0xffffffffffffffff max_cycles: 0x1cd42e4dffb, max_idle_ns: 881590591483 ns [ 0.000033][ T0] tsc: Detected 2199.998 MHz processor [ 0.003985][ T0] last_pfn = 0x240000 max_arch_pfn = 0x400000000 [ 0.004035][ T0] MTRR map: 4 entries (3 fixed + 1 variable; max 19), built from 8 variable MTRRs [ 0.004046][ T0] x86/PAT: Configuration [0-7]: WB WC UC- UC WB WP UC- WT [ 0.004107][ T0] last_pfn = 0xbfffd max_arch_pfn = 0x400000000 [ 0.009095][ T0] found SMP MP-table at [mem 0x000f2890-0x000f289f] [ 0.009119][ T0] Using GB pages for direct mapping [ 0.012752][ T0] ACPI: Early table checksum verification disabled [ 0.012778][ T0] ACPI: RSDP 0x00000000000F2610 000014 (v00 Google) [ 0.012794][ T0] ACPI: RSDT 0x00000000BFFFFFB0 000038 (v01 Google GOOGRSDT 00000001 GOOG 00000001) [ 0.012817][ T0] ACPI: FACP 0x00000000BFFFF370 0000F4 (v02 Google GOOGFACP 00000001 GOOG 00000001) [ 0.012841][ T0] ACPI: DSDT 0x00000000BFFFD900 001A64 (v01 Google GOOGDSDT 00000001 GOOG 00000001) [ 0.012859][ T0] ACPI: FACS 0x00000000BFFFD8C0 000040 [ 0.012873][ T0] ACPI: FACS 0x00000000BFFFD8C0 000040 [ 0.012886][ T0] ACPI: SRAT 0x00000000BFFFFEA0 0000C8 (v03 Google GOOGSRAT 00000001 GOOG 00000001) [ 0.012904][ T0] ACPI: APIC 0x00000000BFFFFDF0 000076 (v05 Google GOOGAPIC 00000001 GOOG 00000001) [ 0.012922][ T0] ACPI: SSDT 0x00000000BFFFF470 000980 (v01 Google GOOGSSDT 00000001 GOOG 00000001) [ 0.012939][ T0] ACPI: WAET 0x00000000BFFFFE70 000028 (v01 Google GOOGWAET 00000001 GOOG 00000001) [ 0.012954][ T0] ACPI: Reserving FACP table memory at [mem 0xbffff370-0xbffff463] [ 0.012962][ T0] ACPI: Reserving DSDT table memory at [mem 0xbfffd900-0xbffff363] [ 0.012968][ T0] ACPI: Reserving FACS table memory at [mem 0xbfffd8c0-0xbfffd8ff] [ 0.012975][ T0] ACPI: Reserving FACS table memory at [mem 0xbfffd8c0-0xbfffd8ff] [ 0.012981][ T0] ACPI: Reserving SRAT table memory at [mem 0xbffffea0-0xbfffff67] [ 0.012988][ T0] ACPI: Reserving APIC table memory at [mem 0xbffffdf0-0xbffffe65] [ 0.012994][ T0] ACPI: Reserving SSDT table memory at [mem 0xbffff470-0xbffffdef] [ 0.013001][ T0] ACPI: Reserving WAET table memory at [mem 0xbffffe70-0xbffffe97] [ 0.013123][ T0] ACPI: SRAT: Node 0 PXM 0 [mem 0x00000000-0x0009ffff] [ 0.013133][ T0] ACPI: SRAT: Node 0 PXM 0 [mem 0x00100000-0xbfffffff] [ 0.013141][ T0] ACPI: SRAT: Node 0 PXM 0 [mem 0x100000000-0x23fffffff] [ 0.013152][ T0] NUMA: Node 0 [mem 0x00001000-0x0009ffff] + [mem 0x00100000-0xbfffffff] -> [mem 0x00001000-0xbfffffff] [ 0.013164][ T0] NUMA: Node 0 [mem 0x00001000-0xbfffffff] + [mem 0x100000000-0x23fffffff] -> [mem 0x00001000-0x23fffffff] [ 0.013185][ T0] Faking node 0 at [mem 0x0000000000001000-0x0000000140000fff] (5120MB) [ 0.013193][ T0] Faking node 1 at [mem 0x0000000140001000-0x000000023fffffff] (4095MB) [ 0.013296][ T0] NODE_DATA(0) allocated [mem 0x13fffac80-0x140000fff] [ 0.014050][ T0] NODE_DATA(1) allocated [mem 0x23fff6c80-0x23fffcfff] [ 0.299744][ T0] KernelAddressSanitizer initialized (generic) [ 0.300562][ T0] ACPI: PM-Timer IO Port: 0xb008 [ 0.300599][ T0] ACPI: LAPIC_NMI (acpi_id[0xff] dfl dfl lint[0x1]) [ 0.300743][ T0] IOAPIC[0]: apic_id 0, version 17, address 0xfec00000, GSI 0-23 [ 0.300759][ T0] ACPI: INT_SRC_OVR (bus 0 bus_irq 5 global_irq 5 high level) [ 0.300768][ T0] ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level) [ 0.300775][ T0] ACPI: INT_SRC_OVR (bus 0 bus_irq 10 global_irq 10 high level) [ 0.300783][ T0] ACPI: INT_SRC_OVR (bus 0 bus_irq 11 global_irq 11 high level) [ 0.300880][ T0] ACPI: Using ACPI (MADT) for SMP configuration information [ 0.300891][ T0] CPU topo: Max. logical packages: 1 [ 0.300895][ T0] CPU topo: Max. logical nodes: 1 [ 0.300899][ T0] CPU topo: Num. nodes per package: 1 [ 0.300907][ T0] CPU topo: Max. logical dies: 1 [ 0.300911][ T0] CPU topo: Max. dies per package: 1 [ 0.300923][ T0] CPU topo: Max. threads per core: 2 [ 0.300928][ T0] CPU topo: Num. cores per package: 1 [ 0.300932][ T0] CPU topo: Num. threads per package: 2 [ 0.300935][ T0] CPU topo: Allowing 2 present CPUs plus 0 hotplug CPUs [ 0.301118][ T0] PM: hibernation: Registered nosave memory: [mem 0x00000000-0x00000fff] [ 0.301128][ T0] PM: hibernation: Registered nosave memory: [mem 0x0009f000-0x000fffff] [ 0.301136][ T0] PM: hibernation: Registered nosave memory: [mem 0xbfffd000-0xffffffff] [ 0.301158][ T0] [gap 0xc0000000-0xfffbbfff] available for PCI devices [ 0.301165][ T0] Booting paravirtualized kernel on KVM [ 0.301177][ T0] clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns [ 0.434008][ T0] Zone ranges: [ 0.434017][ T0] DMA [mem 0x0000000000001000-0x0000000000ffffff] [ 0.434030][ T0] DMA32 [mem 0x0000000001000000-0x00000000ffffffff] [ 0.434038][ T0] Normal [mem 0x0000000100000000-0x000000023fffffff] [ 0.434046][ T0] Device empty [ 0.434050][ T0] Movable zone start for each node [ 0.434054][ T0] Early memory node ranges [ 0.434057][ T0] node 0: [mem 0x0000000000001000-0x000000000009efff] [ 0.434064][ T0] node 0: [mem 0x0000000000100000-0x00000000bfffcfff] [ 0.434072][ T0] node 0: [mem 0x0000000100000000-0x0000000140000fff] [ 0.434079][ T0] node 1: [mem 0x0000000140001000-0x000000023fffffff] [ 0.434088][ T0] Initmem setup node 0 [mem 0x0000000000001000-0x0000000140000fff] [ 0.434107][ T0] Initmem setup node 1 [mem 0x0000000140001000-0x000000023fffffff] [ 0.434154][ T0] On node 0, zone DMA: 1 pages in unavailable ranges [ 0.434395][ T0] On node 0, zone DMA: 97 pages in unavailable ranges [ 0.496160][ T0] On node 0, zone Normal: 3 pages in unavailable ranges [ 0.558203][ T0] setup_percpu: NR_CPUS:8 nr_cpumask_bits:2 nr_cpu_ids:2 nr_node_ids:2 [ 0.558926][ T0] percpu: Embedded 71 pages/cpu s253832 r8192 d28792 u1048576 [ 0.559101][ T0] kvm-guest: PV spinlocks enabled [ 0.559112][ T0] PV qspinlock hash table entries: 256 (order: 0, 4096 bytes, linear) [ 0.559131][ T0] Kernel command line: earlyprintk=serial net.ifnames=0 sysctl.kernel.hung_task_all_cpu_backtrace=1 ima_policy=tcb nf-conntrack-ftp.ports=20000 nf-conntrack-tftp.ports=20000 nf-conntrack-sip.ports=20000 nf-conntrack-irc.ports=20000 nf-conntrack-sane.ports=20000 binder.debug_mask=0 rcupdate.rcu_expedited=1 rcupdate.rcu_cpu_stall_cputime=1 no_hash_pointers page_owner=on sysctl.vm.nr_hugepages=4 sysctl.vm.nr_overcommit_hugepages=4 secretmem.enable=1 sysctl.max_rcu_stall_to_panic=1 msr.allow_writes=off coredump_filter=0xffff root=/dev/sda console=ttyS0 vsyscall=native numa=fake=2 kvm-intel.nested=1 spec_store_bypass_disable=prctl nopcid vivid.n_devs=64 vivid.multiplanar=1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2 netrom.nr_ndevs=32 rose.rose_ndevs=32 smp.csd_lock_timeout=100000 watchdog_thresh=55 workqueue.watchdog_thresh=140 sysctl.net.core.netdev_unregister_timeout_secs=140 dummy_hcd.num=32 max_loop=32 nbds_max=32 \ [ 0.559161][ T0] Kernel command line: comedi.comedi_num_legacy_minors=4 panic_on_warn=1 BOOT_IMAGE=/boot/bzImage root=/dev/sda1 console=ttyS0 [ 0.563598][ T0] Unknown kernel command line parameters "nbds_max=32", will be passed to user space. [ 0.563674][ T0] random: crng init done [ 0.563678][ T0] printk: log buffer data + meta data: 262144 + 917504 = 1179648 bytes [ 0.563877][ T0] software IO TLB: area num 2. [ 0.589844][ T0] Fallback order for Node 0: 0 1 [ 0.589863][ T0] Fallback order for Node 1: 1 0 [ 0.589877][ T0] Built 2 zonelists, mobility grouping on. Total pages: 2097051 [ 0.589884][ T0] Policy zone: Normal [ 0.590528][ T0] mem auto-init: stack:all(zero), heap alloc:on, heap free:off [ 0.590537][ T0] stackdepot: allocating hash table via alloc_large_system_hash [ 0.590547][ T0] stackdepot hash table entries: 1048576 (order: 12, 16777216 bytes, linear) [ 0.594655][ T0] stackdepot: allocating space for 8192 stack pools via memblock [ 1.254315][ T0] ********************************************************** [ 1.254326][ T0] ** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE ** [ 1.254330][ T0] ** ** [ 1.254334][ T0] ** This system shows unhashed kernel memory addresses ** [ 1.254338][ T0] ** via the console, logs, and other interfaces. This ** [ 1.254341][ T0] ** might reduce the security of your system. ** [ 1.254345][ T0] ** ** [ 1.254348][ T0] ** If you see this message and you are not debugging ** [ 1.254352][ T0] ** the kernel, report this immediately to your system ** [ 1.254355][ T0] ** administrator! ** [ 1.254359][ T0] ** ** [ 1.254362][ T0] ** Use hash_pointers=always to force this mode off ** [ 1.254366][ T0] ** ** [ 1.254369][ T0] ** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE ** [ 1.254373][ T0] ********************************************************** [ 1.257770][ T0] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=2 [ 1.382321][ T0] allocated 167772160 bytes of page_ext [ 1.382362][ T0] Node 0, zone DMA: page owner found early allocated 0 pages [ 1.396352][ T0] Node 0, zone DMA32: page owner found early allocated 21120 pages [ 1.400979][ T0] Node 0, zone Normal: page owner found early allocated 131 pages [ 1.412258][ T0] Node 1, zone Normal: page owner found early allocated 19848 pages [ 1.412746][ T0] Kernel/User page tables isolation: enabled [ 1.414991][ T0] Dynamic Preempt: full [ 1.416163][ T0] Running RCU self tests [ 1.416169][ T0] Running RCU synchronous self tests [ 1.416173][ T0] rcu: Preemptible hierarchical RCU implementation. [ 1.416177][ T0] rcu: RCU lockdep checking is enabled. [ 1.416180][ T0] rcu: RCU restricting CPUs from NR_CPUS=8 to nr_cpu_ids=2. [ 1.416186][ T0] rcu: RCU priority boosting: priority 1 delay 500 ms. [ 1.416192][ T0] rcu: RCU callback double-/use-after-free debug is enabled. [ 1.416196][ T0] rcu: RCU_SOFTIRQ processing moved to rcuc kthreads. [ 1.416200][ T0] rcu: RCU debug extended QS entry/exit. [ 1.416203][ T0] No expedited grace period (rcu_normal_after_boot). [ 1.416207][ T0] Trampoline variant of Tasks RCU enabled. [ 1.416210][ T0] Tracing variant of Tasks RCU enabled. [ 1.416213][ T0] rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies. [ 1.416218][ T0] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=2 [ 1.416389][ T0] Running RCU synchronous self tests [ 1.416422][ T0] RCU Tasks: Setting shift to 1 and lim to 1 rcu_task_cb_adjust=1 rcu_task_cpu_ids=2. [ 1.587371][ T0] NR_IRQS: 4352, nr_irqs: 440, preallocated irqs: 16 [ 1.588532][ T0] rcu: srcu_init: Setting srcu_struct sizes based on contention. [ 1.589312][ T0] kfence: initialized - using 2097152 bytes for 255 objects at 0xffff88823be00000-0xffff88823c000000 [ 1.591315][ T0] Console: colour VGA+ 80x25 [ 2.010027][ T0] printk: legacy console [ttyS0] enabled [ 2.010040][ T0] printk: legacy bootconsole [earlyser0] disabled [ 2.010120][ T0] Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar [ 2.010125][ T0] ... MAX_LOCKDEP_SUBCLASSES: 8 [ 2.010129][ T0] ... MAX_LOCK_DEPTH: 48 [ 2.010133][ T0] ... MAX_LOCKDEP_KEYS: 8192 [ 2.010137][ T0] ... CLASSHASH_SIZE: 4096 [ 2.010142][ T0] ... MAX_LOCKDEP_ENTRIES: 1048576 [ 2.010146][ T0] ... MAX_LOCKDEP_CHAINS: 1048576 [ 2.010150][ T0] ... CHAINHASH_SIZE: 524288 [ 2.010154][ T0] memory used by lock dependency info: 106625 kB [ 2.010159][ T0] memory used for stack traces: 8320 kB [ 2.010163][ T0] per task-struct memory footprint: 1920 bytes [ 2.010507][ T0] ACPI: Core revision 20251212 [ 2.012046][ T0] APIC: Switch to symmetric I/O mode setup [ 2.012815][ T0] x2apic enabled [ 2.020232][ T0] APIC: Switched APIC routing to: physical x2apic [ 2.033837][ T0] ..TIMER: vector=0x30 apic1=0 pin1=0 apic2=-1 pin2=-1 [ 2.034270][ T0] clocksource: tsc-early: mask: 0xffffffffffffffff max_cycles: 0x1fb63109b96, max_idle_ns: 440795265316 ns [ 2.034324][ T0] Calibrating delay loop (skipped) preset value.. 4399.99 BogoMIPS (lpj=21999980) [ 2.035150][ T0] Last level iTLB entries: 4KB 64, 2MB 8, 4MB 8 [ 2.035156][ T0] Last level dTLB entries: 4KB 64, 2MB 32, 4MB 32, 1GB 4 [ 2.035235][ T0] mitigations: Enabled attack vectors: user_kernel, user_user, guest_host, guest_guest, SMT mitigations: auto [ 2.035254][ T0] Speculative Store Bypass: Mitigation: Speculative Store Bypass disabled via prctl [ 2.035261][ T0] Spectre V2 : Mitigation: IBRS [ 2.035265][ T0] RETBleed: Mitigation: IBRS [ 2.035269][ T0] ITS: Mitigation: Aligned branch/return thunks [ 2.035274][ T0] Spectre V2 : User space: Mitigation: STIBP via prctl [ 2.035278][ T0] MDS: Mitigation: Clear CPU buffers [ 2.035282][ T0] TAA: Mitigation: Clear CPU buffers [ 2.035286][ T0] MMIO Stale Data: Vulnerable: Clear CPU buffers attempted, no microcode [ 2.035291][ T0] Spectre V1 : Mitigation: usercopy/swapgs barriers and __user pointer sanitization [ 2.035299][ T0] Spectre V2 : Spectre v2 / SpectreRSB: Filling RSB on context switch and VMEXIT [ 2.035324][ T0] Spectre V2 : mitigation: Enabling conditional Indirect Branch Prediction Barrier [ 2.035383][ T0] active return thunk: its_return_thunk [ 2.035404][ T0] Spectre V2 : Spectre BHI mitigation: SW BHB clearing on syscall and VM exit [ 2.035477][ T0] x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers' [ 2.035487][ T0] x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers' [ 2.035495][ T0] x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers' [ 2.035504][ T0] x86/fpu: xstate_offset[2]: 576, xstate_sizes[2]: 256 [ 2.035516][ T0] x86/fpu: Enabled xstate features 0x7, context size is 832 bytes, using 'standard' format. [ 2.432901][ T0] pid_max: default: 32768 minimum: 301 [ 2.435128][ T0] landlock: Up and running. [ 2.435137][ T0] Yama: becoming mindful. [ 2.435670][ T0] TOMOYO Linux initialized [ 2.437241][ T0] AppArmor: AppArmor initialized [ 2.440586][ T0] LSM support for eBPF active [ 2.448832][ T0] Dentry cache hash table entries: 1048576 (order: 11, 8388608 bytes, vmalloc hugepage) [ 2.452274][ T0] Inode-cache hash table entries: 524288 (order: 10, 4194304 bytes, vmalloc hugepage) [ 2.452785][ T0] Mount-cache hash table entries: 16384 (order: 5, 131072 bytes, vmalloc) [ 2.453006][ T0] Mountpoint-cache hash table entries: 16384 (order: 5, 131072 bytes, vmalloc) [ 2.456511][ T0] VFS: Finished mounting rootfs on nullfs [ 2.462592][ T0] Running RCU synchronous self tests [ 2.462606][ T0] Running RCU synchronous self tests [ 2.584212][ T1] smpboot: CPU0: Intel(R) Xeon(R) CPU @ 2.20GHz (family: 0x6, model: 0x4f, stepping: 0x0) [ 2.584312][ T1] Performance Events: unsupported CPU family 6 model 79 no PMU driver, software events only. [ 2.584312][ T1] signal: max sigframe size: 1776 [ 2.594417][ T1] rcu: Hierarchical SRCU implementation. [ 2.594428][ T1] rcu: Max phase no-delay instances is 1000. [ 2.596671][ T1] Timer migration: 1 hierarchy levels; 8 children per group; 0 crossnode level [ 2.831356][ T1] NMI watchdog: Perf NMI watchdog permanently disabled [ 2.832651][ T1] smp: Bringing up secondary CPUs ... [ 2.842298][ T1] smpboot: x86: Booting SMP configuration: [ 2.842308][ T1] .... node #0, CPUs: #1 [ 2.848102][ T1] MDS CPU bug present and SMT on, data leak possible. See https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/mds.html for more details. [ 2.848102][ T1] TAA CPU bug present and SMT on, data leak possible. See https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/tsx_async_abort.html for more details. [ 2.848102][ T1] MMIO Stale Data CPU bug present and SMT on, data leak possible. See https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/processor_mmio_stale_data.html for more details. [ 2.848102][ T1] smp: Brought up 2 nodes, 2 CPUs [ 2.848102][ T1] smpboot: Total of 2 processors activated (8799.99 BogoMIPS) [ 2.848102][ T1] Memory: 6463680K/8388204K available (167732K kernel code, 29737K rwdata, 41216K rodata, 25540K init, 129272K bss, 1736392K reserved, 0K cma-reserved) [ 2.855664][ T1] devtmpfs: initialized [ 2.875959][ T1] x86/mm: Memory block size: 128MB [ 2.974821][ T1] Running RCU synchronous self tests [ 2.974821][ T1] Running RCU synchronous self tests [ 2.974821][ T1] Running RCU Tasks wait API self tests [ 2.977845][ T37] ------------[ cut here ]------------ [ 2.977885][ T37] class_for_each_device called for class 'devlink' before it was registered [ 2.977941][ T37] WARNING: drivers/base/class.c:416 at class_for_each_device+0x2d8/0x390, CPU#1: kworker/1:1/37 [ 2.978137][ T37] Modules linked in: [ 2.978204][ T37] CPU: 1 UID: 0 PID: 37 Comm: kworker/1:1 Not tainted syzkaller #0 PREEMPT_{RT,(full)} [ 2.978308][ T37] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 [ 2.978370][ T37] Workqueue: events deferred_probe_timeout_work_func [ 2.978493][ T37] RIP: 0010:class_for_each_device+0x2fc/0x390 [ 2.978605][ T37] Code: 8d 1d 98 56 26 0a 4c 89 e8 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 ef e8 62 77 9c fc 49 8b 55 00 48 89 df 48 c7 c6 d9 35 6f 8d <67> 48 0f b9 3a b8 ea ff ff ff eb 1b e8 43 e0 31 fc 49 81 c6 90 00 [ 2.978678][ T37] RSP: 0000:ffffc90000ac7a20 EFLAGS: 00010246 [ 2.978751][ T37] RAX: 1ffffffff178a7e0 RBX: ffffffff8fba2d20 RCX: ffff88801ea93e00 [ 2.978821][ T37] RDX: ffffffff8bc553c0 RSI: ffffffff8d6f35d9 RDI: ffffffff8fba2d20 [ 2.978865][ T37] RBP: ffffc90000ac7af8 R08: ffffc90000ac7a7f R09: 0000000000000000 [ 2.978883][ T37] R10: ffffc90000ac7a60 R11: fffff52000158f50 R12: ffffc90000ac7a60 [ 2.978954][ T37] R13: ffffffff8bc53f00 R14: 1ffff92000158f48 R15: dffffc0000000000 [ 2.979016][ T37] FS: 0000000000000000(0000) GS:ffff888125d8b000(0000) knlGS:0000000000000000 [ 2.979091][ T37] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2.979151][ T37] CR2: 0000000000000000 CR3: 000000000dfb8000 CR4: 00000000003506f0 [ 2.979220][ T37] Call Trace: [ 2.979251][ T37] [ 2.979271][ T37] ? __pfx_fw_devlink_no_driver+0x10/0x10 [ 2.979370][ T37] ? __pfx_class_for_each_device+0x10/0x10 [ 2.979515][ T37] ? lockdep_hardirqs_on+0x7a/0x110 [ 2.979597][ T37] ? _raw_spin_unlock_irqrestore+0x4c/0x80 [ 2.979722][ T37] ? mutex_lock_nested+0x152/0x1d0 [ 2.979835][ T37] ? fw_devlink_drivers_done+0x1e/0x50 [ 2.979933][ T37] ? process_one_work+0x8be/0x1630 [ 2.980065][ T37] fw_devlink_drivers_done+0x35/0x50 [ 2.980152][ T37] deferred_probe_timeout_work_func+0x21/0x220 [ 2.980274][ T37] ? process_one_work+0x8be/0x1630 [ 2.980387][ T37] process_one_work+0x98b/0x1630 [ 2.980579][ T37] ? __pfx_process_one_work+0x10/0x10 [ 2.980698][ T37] ? do_raw_spin_lock+0x12b/0x2f0 [ 2.980838][ T37] worker_thread+0xb49/0x1140 [ 2.980966][ T37] ? _raw_spin_unlock_irqrestore+0x30/0x80 [ 2.981151][ T37] kthread+0x388/0x470 [ 2.981197][ T37] ? __pfx_worker_thread+0x10/0x10 [ 2.981320][ T37] ? __pfx_kthread+0x10/0x10 [ 2.981426][ T37] ret_from_fork+0x514/0xb70 [ 2.981553][ T37] ? __pfx_ret_from_fork+0x10/0x10 [ 2.981656][ T37] ? __switch_to+0xc79/0x1410 [ 2.981757][ T37] ? __pfx_kthread+0x10/0x10 [ 2.981874][ T37] ret_from_fork_asm+0x1a/0x30 [ 2.982051][ T37] [ 2.982090][ T37] Kernel panic - not syncing: kernel: panic_on_warn set ... [ 2.982149][ T37] CPU: 1 UID: 0 PID: 37 Comm: kworker/1:1 Not tainted syzkaller #0 PREEMPT_{RT,(full)} [ 2.982247][ T37] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 [ 2.982306][ T37] Workqueue: events deferred_probe_timeout_work_func [ 2.982426][ T37] Call Trace: [ 2.982455][ T37] [ 2.982491][ T37] vpanic+0x56c/0xa60 [ 2.982607][ T37] ? __pfx__printk+0x10/0x10 [ 2.982705][ T37] ? __pfx_vpanic+0x10/0x10 [ 2.982889][ T37] ? is_bpf_text_address+0x292/0x2b0 [ 2.982991][ T37] ? is_bpf_text_address+0x26/0x2b0 [ 2.983144][ T37] panic+0xc5/0xd0 [ 2.983238][ T37] ? __pfx_panic+0x10/0x10 [ 2.983281][ T37] ? ret_from_fork_asm+0x1a/0x30 [ 2.992405][ T37] __warn+0x315/0x4c0 [ 2.992447][ T37] ? class_for_each_device+0x2d8/0x390 [ 2.992447][ T37] ? class_for_each_device+0x2d8/0x390 [ 2.992447][ T37] __report_bug+0x339/0x540 [ 2.992447][ T37] ? class_for_each_device+0x2d8/0x390 [ 2.992447][ T37] ? __pfx___report_bug+0x10/0x10 [ 2.992447][ T37] report_bug_entry+0x19a/0x290 [ 2.992447][ T37] ? class_for_each_device+0x2fc/0x390 [ 2.992447][ T37] ? class_for_each_device+0x301/0x390 [ 2.992447][ T37] handle_bug+0xce/0x200 [ 2.992447][ T37] exc_invalid_op+0x1a/0x50 [ 2.992447][ T37] asm_exc_invalid_op+0x1a/0x20 [ 2.992447][ T37] RIP: 0010:class_for_each_device+0x2fc/0x390 [ 2.992447][ T37] Code: 8d 1d 98 56 26 0a 4c 89 e8 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 ef e8 62 77 9c fc 49 8b 55 00 48 89 df 48 c7 c6 d9 35 6f 8d <67> 48 0f b9 3a b8 ea ff ff ff eb 1b e8 43 e0 31 fc 49 81 c6 90 00 [ 2.992447][ T37] RSP: 0000:ffffc90000ac7a20 EFLAGS: 00010246 [ 2.992447][ T37] RAX: 1ffffffff178a7e0 RBX: ffffffff8fba2d20 RCX: ffff88801ea93e00 [ 2.992447][ T37] RDX: ffffffff8bc553c0 RSI: ffffffff8d6f35d9 RDI: ffffffff8fba2d20 [ 2.992447][ T37] RBP: ffffc90000ac7af8 R08: ffffc90000ac7a7f R09: 0000000000000000 [ 2.992447][ T37] R10: ffffc90000ac7a60 R11: fffff52000158f50 R12: ffffc90000ac7a60 [ 2.992447][ T37] R13: ffffffff8bc53f00 R14: 1ffff92000158f48 R15: dffffc0000000000 [ 2.992447][ T37] ? __pfx_fw_devlink_no_driver+0x10/0x10 [ 2.992447][ T37] ? __pfx_class_for_each_device+0x10/0x10 [ 2.992447][ T37] ? lockdep_hardirqs_on+0x7a/0x110 [ 2.992447][ T37] ? _raw_spin_unlock_irqrestore+0x4c/0x80 [ 2.992447][ T37] ? mutex_lock_nested+0x152/0x1d0 [ 2.992447][ T37] ? fw_devlink_drivers_done+0x1e/0x50 [ 2.992447][ T37] ? process_one_work+0x8be/0x1630 [ 2.992447][ T37] fw_devlink_drivers_done+0x35/0x50 [ 2.992447][ T37] deferred_probe_timeout_work_func+0x21/0x220 [ 2.992447][ T37] ? process_one_work+0x8be/0x1630 [ 2.992447][ T37] process_one_work+0x98b/0x1630 [ 2.992447][ T37] ? __pfx_process_one_work+0x10/0x10 [ 2.992447][ T37] ? do_raw_spin_lock+0x12b/0x2f0 [ 2.992447][ T37] worker_thread+0xb49/0x1140 [ 2.992447][ T37] ? _raw_spin_unlock_irqrestore+0x30/0x80 [ 2.992447][ T37] kthread+0x388/0x470 [ 2.992447][ T37] ? __pfx_worker_thread+0x10/0x10 [ 2.992447][ T37] ? __pfx_kthread+0x10/0x10 [ 2.992447][ T37] ret_from_fork+0x514/0xb70 [ 2.992447][ T37] ? __pfx_ret_from_fork+0x10/0x10 [ 2.992447][ T37] ? __switch_to+0xc79/0x1410 [ 2.992447][ T37] ? __pfx_kthread+0x10/0x10 [ 2.992447][ T37] ret_from_fork_asm+0x1a/0x30 [ 2.992447][ T37] syzkaller build log: go env (err=) AR='ar' CC='gcc' CGO_CFLAGS='-O2 -g' CGO_CPPFLAGS='' CGO_CXXFLAGS='-O2 -g' CGO_ENABLED='1' CGO_FFLAGS='-O2 -g' CGO_LDFLAGS='-O2 -g' CXX='g++' GCCGO='gccgo' GO111MODULE='auto' GOAMD64='v1' GOARCH='amd64' GOAUTH='netrc' GOBIN='' GOCACHE='/syzkaller/.cache/go-build' GOCACHEPROG='' GODEBUG='' GOENV='/syzkaller/.config/go/env' GOEXE='' GOEXPERIMENT='' GOFIPS140='off' GOFLAGS='' GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build2144712873=/tmp/go-build -gno-record-gcc-switches' GOHOSTARCH='amd64' GOHOSTOS='linux' GOINSECURE='' GOMOD='/syzkaller/jobs-2/linux/gopath/src/github.com/google/syzkaller/go.mod' GOMODCACHE='/syzkaller/jobs-2/linux/gopath/pkg/mod' GONOPROXY='' GONOSUMDB='' GOOS='linux' GOPATH='/syzkaller/jobs-2/linux/gopath' GOPRIVATE='' GOPROXY='https://proxy.golang.org,direct' GOROOT='/usr/local/go' GOSUMDB='sum.golang.org' GOTELEMETRY='local' GOTELEMETRYDIR='/syzkaller/.config/go/telemetry' GOTMPDIR='' GOTOOLCHAIN='auto' GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64' GOVCS='' GOVERSION='go1.26.0' GOWORK='' PKG_CONFIG='pkg-config' git status (err=) HEAD detached at d6526ea3e6a nothing to commit, working tree clean tput: No value for $TERM and no -T specified tput: No value for $TERM and no -T specified Makefile:31: run command via tools/syz-env for best compatibility, see: Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env go list -f '{{.Stale}}' -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=d6526ea3e6ad9081c902859bbb80f9f840377cb4 -X github.com/google/syzkaller/prog.gitRevisionDate=20251126-113115" ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=d6526ea3e6ad9081c902859bbb80f9f840377cb4 -X github.com/google/syzkaller/prog.gitRevisionDate=20251126-113115" ./sys/syz-sysgen make .descriptions tput: No value for $TERM and no -T specified tput: No value for $TERM and no -T specified Makefile:31: run command via tools/syz-env for best compatibility, see: Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env bin/syz-sysgen touch .descriptions GOOS=linux GOARCH=amd64 go build -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=d6526ea3e6ad9081c902859bbb80f9f840377cb4 -X github.com/google/syzkaller/prog.gitRevisionDate=20251126-113115" -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog mkdir -p ./bin/linux_amd64 g++ -o ./bin/linux_amd64/syz-executor executor/executor.cc \ -m64 -O2 -pthread -Wall -Werror -Wparentheses -Wunused-const-variable -Wframe-larger-than=16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-format-overflow -Wno-unused-but-set-variable -Wno-unused-command-line-argument -static-pie -std=c++17 -I. -Iexecutor/_include -DGOOS_linux=1 -DGOARCH_amd64=1 \ -DHOSTGOOS_linux=1 -DGIT_REVISION=\"d6526ea3e6ad9081c902859bbb80f9f840377cb4\" /usr/bin/ld: /tmp/ccbE5gaR.o: in function `Connection::Connect(char const*, char const*)': executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0x386): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking ./tools/check-syzos.sh 2>/dev/null